Search found 17 matches

by Yuting Zhu 3D
Sat Dec 09, 2017 8:11 pm
Forum: Naming
Topic: Test 4
Replies: 4
Views: 390

Re: Test 4

I was also wondering about how to determine the number after the name?
by Yuting Zhu 3D
Sat Dec 09, 2017 7:59 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to the trends of Periodic Tables
Replies: 1
Views: 152

Exceptions to the trends of Periodic Tables

Do we need to know the exceptions to the trends of Period Tables. Such as Oxygen has a lower ionization energy than Fluorine?
If so, could someone please help me with listing out which ones are we suppose to memorize?
Thank you!
by Yuting Zhu 3D
Sun Dec 03, 2017 10:15 pm
Forum: Ideal Gases
Topic: Temperature in PV=nRT
Replies: 9
Views: 555

Re: Temperature in PV=nRT

Just adding to that, temperature is the most determining factor of the characteristic of the gas.
by Yuting Zhu 3D
Sun Dec 03, 2017 10:12 pm
Forum: Ideal Gases
Topic: Kp and Kc
Replies: 7
Views: 571

Re: Kp and Kc

I think it just depends on the facts you are given in the problem. When you are given concentrations of gases, you are using Kc, while if you are given the partial pressures, then you should use Kp.
by Yuting Zhu 3D
Sun Dec 03, 2017 10:10 pm
Forum: Ideal Gases
Topic: Partial Pressure
Replies: 4
Views: 603

Re: Partial Pressure

Could someone please tell me in what cases are we gonna use partial pressure in problems of ideal gases?
by Yuting Zhu 3D
Tue Nov 21, 2017 7:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals
Replies: 4
Views: 254

Re: Radicals

To answer the question, "Do radical electrons count as a region of electron density?"
Yes, it is counted as a high electron density region and can be treated like a lone pair.
by Yuting Zhu 3D
Tue Nov 21, 2017 7:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 180degrees and lone pairs?
Replies: 4
Views: 201

Re: 180degrees and lone pairs?

The electron arrangement and the molecular shape are two different things since the molecular shape only considers atoms but not lone pairs.
The electron arrangement could be trigonal bipyramidal. But could it also be octahedral with four lone pairs? Can someone answer that for me?
by Yuting Zhu 3D
Wed Nov 15, 2017 7:50 pm
Forum: Dipole Moments
Topic: Polar and non-polar molecules
Replies: 2
Views: 154

Polar and non-polar molecules

Could someone please help me with how to determine whether a molecule is polar or not? Is there an easy way to do it?
by Yuting Zhu 3D
Wed Nov 15, 2017 7:41 pm
Forum: Hybridization
Topic: Hybridization significance
Replies: 2
Views: 198

Re: Hybridization significance

Also, hybridization can form more stable and orbitals are lower in energy.
by Yuting Zhu 3D
Thu Nov 02, 2017 6:47 pm
Forum: Ionic & Covalent Bonds
Topic: How to easily tell between Ionic and Covalent bonds?
Replies: 8
Views: 496

Re: How to easily tell between Ionic and Covalent bonds?

This is a general way. However, the most accurate way to determine whether the bond is covalent or ionic is to check the electronegativity difference.If the difference is less than 1.5, it is covalent, and if it is larger than 2, it is ionic. Hope this helps!
by Yuting Zhu 3D
Thu Nov 02, 2017 6:30 pm
Forum: Quantum Numbers and The H-Atom
Topic: Core, Closed shell, and valence electrons
Replies: 2
Views: 220

Re: Core, Closed shell, and valence electrons

The inner core also consists of electrons in other energy levels surrounding the nucleus.
by Yuting Zhu 3D
Tue Oct 24, 2017 9:08 pm
Forum: *Shrodinger Equation
Topic:
Replies: 4
Views: 386

Re: Hψ

Also, to add on, Hamilton is a double derivative.
by Yuting Zhu 3D
Tue Oct 24, 2017 9:05 pm
Forum: *Particle in a Box
Topic: Particle in the box: Wavelength [ENDORSED]
Replies: 1
Views: 493

Particle in the box: Wavelength [ENDORSED]

I am just really confused about the Particle in the box concept in general. Could someone explain to me why there's only a certain range of wavelength is allowed in the box? And also, how does that link to Quantum World?
by Yuting Zhu 3D
Sun Oct 15, 2017 3:15 pm
Forum: Photoelectric Effect
Topic: Work Function vs. Threshold Energy [ENDORSED]
Replies: 5
Views: 419

Re: Work Function vs. Threshold Energy [ENDORSED]

When you see it on quizzes or tests, they basically mean the same thing. When light hit the surface, the photon energy (from the light source) has to be bigger or equal to work function/threshold energy in order to remove the electron.
by Yuting Zhu 3D
Sun Oct 15, 2017 3:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Formal Charge
Replies: 3
Views: 396

Re: Formal Charge

Yes, lone pairs are definitely valence electrons. However, they do not have bonds, so you don't have to divide them by two. In order to utilize this formula, I believe that you should be able to draw the lewis structure. Hope this helps!
by Yuting Zhu 3D
Sun Oct 15, 2017 2:54 pm
Forum: Balancing Chemical Reactions
Topic: Determining States of Matter in Reactions
Replies: 7
Views: 814

Re: Determining States of Matter in Reactions

When an element or compound is in it's aqueous state, it means that it is dissolved in a solvent, and became a solution.
However, when an element or compound has to reach its boiling point in order to be in its liquid state.
So there is a huge difference here.
by Yuting Zhu 3D
Sun Oct 15, 2017 2:44 pm
Forum: Properties of Light
Topic: Lyman and Balmer Series Significance
Replies: 4
Views: 512

Lyman and Balmer Series Significance

I understand how both Lyman and Balmer Series are special groups of lights that matches with the energy level difference. But could someone explain more about it for me? Why is it Significant? What kind of problems will ask you to use the properties of these two series?

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